The label page can be found as a sub page to project settings on the left.
Creating a label
Here you will find the label button on the top right.
By clicking on it, a bar at the top of the window will appear.
Choose the color of the new label
Choose a name
Add it to a group (optional)
Click the add button
Changing a label
Select one or more labels to overwrite their settings.
Deleting a label
If a label is not connected to an issue or a document you can click on delete in the rightmost column.
It is not possible to delete a label group.